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2019-7-24 5:13:34


Yokomichi H, et al. Incidence of hospitalisation for severe complications of influenza virus infection in Japanese patients between 2012 and 2016: a cross-sectional study using routinely collected administrative data. BMJ Open. 2019 Jan 17;9(1):e024687
submited by kickingbird at Feb, 21, 2019 19:40 PM from BMJ Open. 2019 Jan 17;9(1):e024687

OBJECTIVE:
To calculate the incidence of hospitalisation due to acute respiratory failure, pneumonia, acute respiratory distress syndrome (ARDS), febrile seizures and encephalitis/encephalopathy among influenza-positive patients in Japan, where point-of-care tests are routinely used to diagnose influenza.
DESIGN:
A cross-sectional study using routinely collected data.
SETTING:
Japanese clinics and hospitals between 2012 and 2016.
PARTICIPANTS:
Japanese patients aged 0-74 years diagnosed with influenza by a rapid test in employment-related health insurance records.
PRIMARY OUTCOME MEASURES:
Incidence of hospitalisation per 100?000 influenza-positive episodes.
RESULTS:
We included over 16?million influenza-positive episodes, 1.0% of whom were hospitalised. Of these, 3361 were acute respiratory failure, 27?253 pneumonia, 18 ARDS, 2603 febrile seizure and 159 encephalitis/encephalopathy. The percentage of hospitalisations by age was 2.96% of patients aged 0-1 years, 0.77% aged 2-5, 0.51% aged 6-12, 0.78% aged 13-18, 1.36% aged 19-44, 1.19% aged 45-64, and 2.21% aged 65-74. The incidence of hospitalisations from these five complications combined was highest in influenza-positive patients aged 0-1 years (943 per 100 000) compared with 307 in those aged 2-5 years and 271 in those aged 65-74 years. For pneumonia, the incidence was highest for influenza-positive patients aged 0-5 years and 65 years or more. There were statistically significant decreasing trends over the years in the incidence of all-cause hospitalisations, pneumonia and febrile seizures.
CONCLUSIONS:
Japanese administrative data revealed that 1.0% of influenza-positive patients aged under 75 years were hospitalised. Male patients had a higher incidence of pulmonary complications and febrile seizures. Children aged 0-5 years and adults aged 65-74 years were at high risk of being admitted to hospital for pneumonia.

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